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Document and Entity Information
Sep. 12, 2019
Document And Entity Information [Line Items]  
Entity Registrant Name SAUL CENTERS INC
Amendment Flag false
Entity Central Index Key 0000907254
Document Type 8-K
Document Period End Date Sep. 12, 2019
Entity Incorporation State Country Code MD
Entity File Number 1-12254
Entity Tax Identification Number 52-1833074
Entity Address, Address Line One 7501 Wisconsin Avenue
Entity Address, City or Town Bethesda
Entity Address, State or Province MD
Entity Address, Postal Zip Code 20814
City Area Code (301)
Local Phone Number 986-6200
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common Stock, $0.01 par value
Trading Symbol BFS
Security Exchange Name NYSE
Series C Preferred Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 6.875% Series C Preferred Stock, $0.01 par value
Trading Symbol BFS/PRC
Security Exchange Name NYSE
M 6.125 Series D Preferred Stock 0.01 Par Value [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 6.125% Series D Preferred Stock, $0.01 par value
Trading Symbol BFS/PRD
Security Exchange Name NYSE
M 6.000 Series E Preferred Stock 0.01 Par Value [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 6.000% Series E Preferred Stock, $0.01 par value
Trading Symbol BFS/PRE
Security Exchange Name NYSE